Abstract
Study on distribution characteristics of powder flux is helpful to improve stability during laser cladding. The definition of powder transport ratio is given by the mass ratio of powder particles fed into the molten pool to all powders transported in the process of laser cladding by lateral powder feeding. Based on law of mass conservation and kinematic equation in physics, a powder transport model for flow field with Gaussian distribution is established and a mathematical expression of powder transport ratio is proposed. Then, the model is applied to calculate cross-sectional area of clad layer formed by powders falling into the molten pool. Theoretical and experimental value have the same variation with process parameters, and modified theoretical value is much closer to the latter. Theoretical powder transport ratio is also confirmed by experimental powder capturing efficiency. So the powder transport model can be used for fundamental study of actual powder flow field. In addition, comparing with cylindrical type, Gaussian powder flow field is more realistic.
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Acknowledgements
Technical advices from Yongzhong Zhang, Yantao Liu, and Mingkun Liu in GRINM are greatly appreciated.
Funding
This work is financially supported by Basic Scientific Research Service Fee of Central University (No. 3142015012) and Langfang Science and Technology Research Development Program (No. 2017011035).
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Gong, X., Wang, J. & Feng, H. Lateral powder transport model with Gaussian distribution in laser cladding. Int J Adv Manuf Technol 102, 3747–3756 (2019). https://doi.org/10.1007/s00170-019-03499-3
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DOI: https://doi.org/10.1007/s00170-019-03499-3